Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Studies on Deacidification of Premature Citrus Juices by Electrodialysis

전기투석에 의한 미숙온주밀감 주스의 탈산에 관한 연구

  • Ko, Won-Joon (Jeju Provincial Development Corporation) ;
  • Yang, Min-Ho (Department of Food Bioengineering, Cheju National University) ;
  • Kang, Yeung-Joo (Department of Food Bioengineering, Cheju National University)
  • 고원준 (제주도지방개발공사) ;
  • 양민호 (제주대학교 식품생명공학과) ;
  • 강영주 (제주대학교 식품생명공학과)
  • Published : 2006.04.01
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Abstract

Juice obtained from premature citrus fruits was deacidified by electrodialysis (ED), and its physicochemical and functional properties were evaluated. Total acidities decreased from 3.15 (Aug), 1.62 (Sep), and 1.45% (Oct) to 2.37 (Aug), 0.86 (Sep), and 0.74% (Oct) by electrodialysis for 100 min, respectively, whereas $^{\circ}Brix$ to acid ratio increased, and pH and color remained almost unchanged. Free sugar content of premature citrus juice remained almost unchanged, while organic acid content decreased significantly. Narirutin and hesperidin contents among flavonoids slightly, but not significantly, decreased. $K^+,\;PO_4\;^{2-},\;SO_42^-,\;and\;Cl^-$ contents decreased by ED, with $K^+$ content showing more than 60% decrease, while $Na^+$ content increased 2.5-3.5 times. Total polyphenol content and electron-donating ability decreased slightly by ED, while nitrite-scavenging ability remained almost constant. Sensory evaluation indicated juice (Sep) subjected to ED processing to $12^{\circ}Brix$ with sugar had the highest preference.

제주지역에서 8, 9, 10월에 수상 적과하여 폐기되는 감귤 미숙(청)과를 자원화하기 위해 전기투석을 이용하여 착즙주스의 과도한 유기산을 제거하고, 이화학적 특성 및 기능적 특성에 대한 전기투석의 영향을 조사하였다. 착즙주스의 100분 전기투석 결과 총 산도는 3.15(8월), 1.62(9월), 1.45%(10월)에서 2.37(8월), 0.86(9월), 0.74%(10월)로 감소하였으며, $^{\circ}Brix$도 약간 감소하였으나 결과적으로 당산비는 각각 9.4%, 59.7%, 70.6% 증가하였다. 그러나 pH, 환원당 및 색도는 거의 변화가 없었다. 착즙액의 유리당은 거의 변화가 없었지만, 유기산 함량은 상당히 감소하였다. Flavonoids인 narirutin, hesperidin의 함량도 전기투석에 의해 약간 감소하였지만 유의적 차이는 없었다. 측정된 이온성분 중$K^+,\;PO_4\;^{2-},\;SO_4\;^{2-},\;Cl^-$의 함량은 전기투석에 의해 감소하였으며, 그 중에서도 $K^+$이 60% 이상으로 감소율이 가장 컸다. 그러나 $Na^+$함량만은 2.5-3.5배 증가하였다. 총 폴리페놀 및 전자공여 작용은 전기투석에 의해 각각 감소하였으나, 아질산염 소거효과는 거의 변화가 없었다. 미숙감귤착즙원액과 100분 전기투석한 미숙감귤착즙액을 가지고 색, 향, 맛,종합적기호도에 대해 관능검사를 실시한 결과 100분 전기투석한 미숙감귤착즙액이 종합적 기호도가 더 좋은 것 으로 조사되었고, 100분 전기투석한 미숙감귤착즙액을 가지고 $12^{\circ}Brix$로 가당을 한 후 기호성을 조사한 결과 산 함량이 적당한 9월 미숙감귤착즙액이 가장 좋은 것으로 조사되었다.

Keywords

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